Door.



ATTORNEY INVENTORS.

lzlvnivd Amr. 20, 1918.

2 bHEElS SHEETI wir F. W. DIY I'MA.

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lntvrni'vd Aug'. 20, 1918.

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INVENTQRS- UNITED STATES PATNT OFFICE.

FMX W. DITTMAN, F NEW YORK, ANED EDMUND W. BAGGOTT, OF BROOKLYN, NEWYORK., AJ'SSIGN'OIRSA 0F ONE-THmD TO BUMSEY W. SCOTT, OF MONTCLAB, NEW

JERSEY.

DOOR.

Specication of Letters Patent. Patented Al1g. 20, 1918.

Application and March 12, 191s. seri no. 221,999,

To all 'whom it may concern:

Be it known that we, Fiumi; W. Drrr- MAN, a citizen of the UnitedStates, residing in Fordham, in the city, county, and State of New York,and EDMUND W. BAG- Go'rr, a citizen of the United States, residing inBrooklyn, in the county of Kings and State of New York, have invented a.new and useful Improvement in Doors, of which the following is aspecification.

Our invention relates to an improvement in doors or gates and hasparticular reference to hatchway doors and the like which are capable ofbeing raised to pass the sill of the door-opening at the next floor.

Devices for this purpose, and as hereto- :fore constructed, have usuallybeen of a flexible type, traveling in curved or inclined guides So thatas the door is raised it will be flexed to ass the projectngdoor-sill atthe next lan ing. Necessarily, such devices must be of a more or lessiiimsy construction and, therefore, are not well able to withstand therough usage to which such devices are subject. Another inherent defectof such devices is that they are soon fractured from frequent tlexuresdue to traveling in the curved guideways; and, further, such devices arenot reliable in operation as they frequently jam in the guides and -forthat reason the hatchway may he left only partially closed, oftentimesresulting in serious accidents.

In addition to the doors or gates referred to above, reproof doors ofsome sort must be provided to comply with the fire underwriters laws andbuilding regulations of the various States. Such doors may be eitherrigid or flexible, as may be desired, but are universally maintained inan. open position, except in case of fire when they are supposed toautomatically close. Obviously, so far as successfully overcoming lirehazards in buildings is concerned, such structures are defective, asdoors for this purpose should be maintained closed at all times, except,of course, when it is desired to have access to the hatchway at anyparticular fioor.

To this end, therefore., we have provided a door which will do the workheretofore accomplished by the two devices referred to abovei and whichpossesses the additional advantage that, while it is capable of passingthe door-sill at the next landing, ,it may be made rigid, if desired,and be guided in a plain, straight track. The door of the presentapplication is always maintained closed, except when access is desiredto the hatchvvay at a particular floor landing and, as the door isguided in a.' straight track, the danger of jamming in the guides, whichhas been so troublesome with the hatchway doors heretofore in use,iseliminated.

IVe have shown our invention appliedto a hatchway, but it is to beunderstood that this application is merely illustrative, as obviouslythe invention is capable of use in other situations.

In the accompanying drawings, Figures 1 and 2 show an embodiment of ourinvention in front and side elevation, respectively,

Fig. 3 is a plan view thereof, while Figs. 4 and 5 are enlarged views ofthe apparatus of Fig. 2.

Referring to the drawings in detail, 1 designates a door which may bemade of metal, or other suitable reproof material. Vertical guides 2 areprovided for lthe purpose of receiving rollers 3 mounted on the end of apair of arms or cranks ,t, pivotally attached to the door 1, one crankat each side. A pair of quadrants 5 are provided at each side of thedoor and are pivotallv secured thereto, A portion of each quadrant isoperatively connected to each of the cranks 4, already referred to, bylinks 6, the quadrant carrying a roller 7, similar to the rollers 3,already referred to, traveling in the guides 2. In other words, eachside of the door isY operatively connected to the guides 2 bycranks 4,quadrants 5 and links 6. Secured to one of the quadrants 5 is acounterweight cable 8 passing over a sheave 9 and secured tocounterweight 10. The other quadrant has secured to it a counterweightcable 11 passing over sheaves 12 and 13 and secured to thecounterweight10, just referred to. The counterweight is about equal to the weight ofthe gate 1 so that the gate may 'be raised and lowered with facility. l

The door is shown in Figs. 2 and 4 in closed' position resting on thedoor-sill or jamb 13. The gate may be raised and lowered by power ormanually-operated means, as may be desired.

Assuming now that it is desired to manipulate the gate from the fullline position of Figs. 2 and 4 to the dotted line position, the firstupward movement of the gate causes the cranks 4 and quadrants 5 to berotated about their respective connections to the links 6 with theresult. that the door is moved or retired horizontally from thedoor-sill 1B until the quadrants 5 engage the stops 14 on the door, itbeingr understood, of course, that there are two otl tht-.se stops, oneon each side of the door. At this time, the. parts will be in theposition shoun in Fig, 4, for instante, in dotted lines, and the doormay be moved upu-'ardly to clear the doorsill 15 at the next landing, asshown in Fig. 2, the rolleis carried by the ends of the cranks 4 andquadrants 5 traveling in the guides 2. It should be noted at this timethat. the eounterweight cables 8 and 1l are secured to the lower part ofthe quadrants 5, s`o that as the quadrants are swung about their pivotalconnections to the links 6, the leads of the cables 8 and 11 will bealways in a straight line, which is an obvious 'advantage in that thereis no liability of the cables creeping off their respective sheaves.Now, when the door is operated in the reverse direction, it will slidefreely down by the door-sill 15. thc rollers on the cranks 1 andquadrants 5 traveling downwardly in the guides 2 until the rolleiis` onthe quadrants 5 engage stops 16 provided in each guide. As soon as thistakes place,

the door will be moved outwardly again to assume the full line positionin Figs. 2 and 4 and close the hatchway opening.

It will be apparent. from the foregoing description that the door inoperation is retired from the door-sill traveling in a horizontal andvertical direction, but with the door maintained in position throughoutits range' of movement parallel to its initial position and that thedoor may be moved upwardly past the door-sill at the next landingwithout any fiexing of the door or Without the use of curved or inclinedguides of any. sort. Inasmuch as there is no binding action throughout aWhole cycle of operation of our device, jamming of the door iseliminated, which, of course, is a great advantage, as we have alreadypointed out, over existing devices as the atchway will always be fullyprotected. The counterweighting of the door may be adjusted to suitvarying conditions, but, as we have outlined above, we pre-fer to haveit almost exactly eounterbalanced` particularly with a door which isoperated by hand.

While we have illustrated and described the preferred embodiment of ourinvention, it is to be understood that we do not wish to be limited tothe exact details of construction described, as obviously variousdepartures could be made therefrom within the scope of the present.invention.

lVliat we claim is ne and desire to secure by Letters Patent of theUnited States l. The combination of a vertically movable rigid elevatorhatchway doorand pivoted link mechanism controlling the movement of thesaniewliei'eby when a force is applied to the door in the plane of thedoor to pen the saine, the door will be constrained to be movedcontinuouslyr in one vert-ical direction. and during a portion of itsmovement outwardly from the door opening.

2. The combination of a vertically movable door, and pivoted linkmechanism interposed between the door and its lguide, whereby1 when aforce is applied to the door in the plane of the door to open the saine,the door will be constrained to be moved continuously in one verticaldirection, and

during a portion of its movement all por- -I tions of the doorsimultaneously 'moving outwardly from the door opening.

3. The combination of a vertically movable hatchway door, acounterweight therefor, a plurality of means to which the counterweightrope i's directly attached to prevent canting of the door when inoperation, said means constraining the door to be moved continuously inone vertical direction and iii a direction away from the door sillduring a portion of its movement, when being actuated to open position.

-l. The combination of a vertically movable door, links interposedbetween the door and its guide for operating the same, sectors carriedby said links, and a counterweight for the door secured to said sectors,

5. The combination of a vertically movable hatchway door, linksinterposed between the door and its guide, and so positioned that theface of the dooi` toward its hatchway is free from projections, saidlinksconstraining the door when a force is applied to it in the plane ofthe door, to be moved continuously in one vertical direction and alsooutwardly from the hatchway opening during the first portion ofthevertical movement of the door.

6. The combination of a vertically movable hatchway door, links carriedthereby, having one of their ends secured to the door and their otherends` operatively connected to each other, rails on which the latterends of the links travel, said links constraining the door when actuatedby a force applied to the door in the plane of the `door to travelcontinuously in one vertical direction, and during a portion of itsmovement outwardly from the door opening swinging about the points ofattachment of the links to each other.

iis l 7. Tlie combination of a liatcliway door, .nks carried thereby,means pivotally seured to said links and meintaining them paced 4fromeach other, said links eontrol ing the movements of ,the door to 'causehe same to be moved continuously in one 'erticnl direction When the dooris actuated )y a, force applied thereto in the plane of lle door` andsimultaneously during n por- :on of said vertical movement to be retiredfrom or moved toward the liatchwny open ing, the links at the limit oftheir movement to move the door toward the hatehway beingr substantiallyat right angles to tlie face of the door.

8. A guideway, a traveler sliding in the guideway, e door, a transverselink connecting the door to said traveler, and means actuating the doorin a direction generally parallel to said guideway wherebymovement ofthe door in its plane will cause a, movement transverse to said plane.

9, The combination of a vertically movnble elevator hatchway door, astraight stationuriy track or gnideway for the door and links interposedbetween the door and the gnidewny, whereby when e force is applied tothe door in the plane of the door to open snmefthe door will beconstrained to move continually in one vertical direction and during :-1portion of its movement all parts of the door simultaneously movingaway' from the door opening in n plane transverse to the plane of thedoor.

FRANK W. DITTMAN. ,EDMUND W. BAGGOTT.

